Source:

Fixed issue

Fixed an issue that caused the out-of-box synchronization rule “Out to AD – User ImmutableId” to be removed

Fixed an issue that causes out-of-box synchronization rules to have precedence value that is less than 100

Fixed an issue where the Domain and OU Filtering screen in the Azure AD Connect wizard is showing Sync all domains and OUs option as selected, even though OU-based filtering is enabled.

Fixed an issue that caused the Configure Directory Partitions screen in the Synchronization Service Manager to return an error if the Refresh button is clicked. The error message is “An error was encountered while refreshing domains: Unable to cast object of type ‘System.Collections.ArrayList’ to type ‘Microsoft.DirectoryServices.MetadirectoryServices.UI.PropertySheetBase.MaPropertyPages.PartitionObject.” The error occurs when new AD domain has been added to an existing AD forest and you are trying to update Azure AD Connect using the Refresh button.

Fixed an issue that caused the out-of-box synchronization rule “Out to AD – User ImmutableId” to be removed when OU-based filtering configuration is updated. This synchronization rule is required for the msDS-ConsistencyGuid as Source Anchor feature

You are connecting to more than one forest. Express setup only connects to one forest.

You are not using a SQL Server Express LocalDB database.

The AD Connector account is not the default MSOL_ account anymore.

The server is set to be in staging mode.

You have enabled the user writeback feature.

Notes:

The scope expansion of the Automatic Upgrade feature affects customers with Azure AD Connect build 1.1.105.0 and after. If you do not want your Azure AD Connect server to be automatically upgraded, you must run following cmdlet on your Azure AD Connect server: